SN8P1829
8-Bit MCU build-in 12-bit ADC + PGIA + Charge-pump Reg 128 dots LCD driver
SONiX TECHNOLOGY CO., LTD
Page 25
Version 1.0
X REGISTERS
There are two major functions of the X register. First, X register can be used as working registers. Second, the X
registers must be clear in order to look-up the ROM data. The SN8P1700’s program counter only has 12-bit. In look-up
table function, the users can omit X register.
X initial value = 0000 0000
085H
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
X
XBIT7 XBIT6 XBIT5 XBIT4 XBIT3 XBIT2 XBIT1 XBIT0
R/W R/W R/W R/W R/W R/W R/W R/W
Note: Please consult the “LOOK-UP TABLE DESCRIPTION” about X register look-up table application.
R REGISTERS
The R register is an 8-bit buffer. There are two major functions of the register. First, R register can be working registers.
Second, the R registers can be store high-byte data of look-up ROM data. After MOVC instruction executed, the
high-byte data of a ROM address will stores in R register and the low-byte data in ACC.
R initial value = 0000 0000
082H
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R
RBIT7 RBIT6 RBIT5 RBIT4 RBIT3 RBIT2 RBIT1 RBIT0
R/W R/W R/W R/W R/W R/W R/W R/W
